SL-18190 WIP -- Take 2 on linear space windlight (more methodical approach -- make desired interface but brute force color conversions). Placeholder PBR water and move to deprecate forward rendering shaders.

SL-18190 WIP - Windlight to linear space proof of concept, better parity between release viewer and materials viewer when reflections disabled.  Avoid run-away probe ambiance.

SL-17705 Backwards compatibility pass.  Support OpenGL pre-4.0 by disabling reflection probes and anti-aliasing.  Get render parity with current release viewer when reflection probes are disabled.

SL-18190 Reduce banding (stay in linear space as much as possible, increase precision of reflection probes).  Faster radiance and irradiance map generation.

SL-17701 WIP -- Correct color space management for base color and emissive color factors and textures.  Support for double sided alpha blended PBR materials.

SL-17701 WIP -- Cleanup/refactor PBR lighting implementation and get parity between deferred and alpha passes for sunlight and IBL.

SL-18095 Add tangents to mesh assets so we can calculate mikktspace tangents in the mesh's original coordinate frame.

SL-18095 WIP -- Add Mikktspace tangent generation for PBR materials and switch to per-pixel binormal generation.  Still bugged with some test content.

Fix irradiance gen up vector to be properly normalized